/*!
 * jQuery Stepy - A Wizard Plugin - http://wbotelhos.com/stepy
 * ------------------------------------------------------------------------------------
 *
 * jQuery Stepy is a plugin based on FormToWizard that generates a customizable wizard.
 * 
 * Licensed under The MIT License
 * 
 * @version        1.0.0
 * @since          2010.07.03
 * @author         Washington Botelho
 * @documentation  wbotelhos.com/stepy
 * @twitter        twitter.com/wbotelhos
 * 
 * Usage with default values:
 * ------------------------------------------------------------------------------------
 * $('#step').stepy();
 *
 *	<form id="step">
 *		<fieldset title="Step 1">
 *			<legend>description one</legend>
 *			<!-- input fields -->
 *		</fieldset>
 *
 *		<fieldset title="Step 2">
 *			<legend>description one</legend>
 *			<!-- input fields -->
 *		</fieldset>
 *
 *		<input type="submit" class="finish" value="Finish!"/>
 *	</form>
 *
 */

;(function ($) {

    var methods = {
        init: function (options) {
            return this.each(function () {

                var opt = $.extend({}, $.fn.stepy.defaults, options),
                    $this = $(this).data('options', opt),
                    id = $this.attr('id');

                if (id === undefined || id == '') {
                    id = 'stepy-' + $('.' + $this.attr('class')).index(this);
                    $this.attr('id', id);
                }

                var $titlesWrapper = $('<ul/>', {id: id + '-titles', 'class': 'stepy-titles clearfix'});

                if (opt.titleTarget) {
                    $(opt.titleTarget).html($titlesWrapper);
                } else {
                    $titlesWrapper.insertBefore($this);
                }

                if (opt.validate) {
                    jQuery.validator.setDefaults({ignore: opt.ignore});

                    $this.append('<div class="stepy-error clearfix"/>');
                }

                var $steps = $this.children('fieldset'),
                    $step = undefined,
                    $legend = undefined,
                    description = '',
                    title = '';

                $steps.each(function (index) {
                    $step = $(this);

                    $step
                        .addClass('step')
                        .attr('id', id + '-step-' + index)
                        .append('<p id="' + id + '-buttons-' + index + '" class="' + id + '-buttons"/>');

                    $legend = $step.children('legend');

                    if (!opt.legend) {
                        $legend.hide();
                    }

                    description = '';

                    if (opt.description) {
                        if ($legend.length) {
                            description = '<span>' + $legend.html() + '</span>';
                        } else {
                            $.error(id + ': the legend element of the step ' + (index + 1) + ' is required to set the description!');
                        }
                    }

                    title = $step.attr('title');
                    title = (title != '') ? '<div>' + title + '</div>' : '--';

                    $titlesWrapper.append('<li id="' + id + '-title-' + index + '">' + title + description + '</li>');

                    if (index == 0) {
                        if ($steps.length > 1) {
                            methods.createNextButton.call($this, index);
                        }
                    } else {
                        methods.createBackButton.call($this, index);

                        $step.hide();

                        if (index < $steps.length - 1) {
                            methods.createNextButton.call($this, index);
                        }
                    }
                });

                var $titles = $titlesWrapper.children();

                $titles.first().addClass('current-step');

                var $finish = $this.children('.finish');

                if (opt.finishButton) {
                    if ($finish.length) {
                        var isForm = $this.is('form'),
                            onSubmit = undefined;

                        if (opt.finish && isForm) {
                            onSubmit = $this.attr('onsubmit');
                            $this.attr('onsubmit', 'return false;');
                        }

                        $finish.click(function (evt) {
                            if (opt.finish && !methods.execute.call($this, opt.finish, $steps.length - 1)) {
                                evt.preventDefault();
                            } else {
                                if (isForm) {
                                    if (onSubmit) {
                                        $this.attr('onsubmit', onSubmit);
                                    } else {
                                        $this.removeAttr('onsubmit');
                                    }

                                    var isSubmit = $finish.attr('type') == 'submit';

                                    if (!isSubmit && (!opt.validate || methods.validate.call($this, $steps.length - 1))) {
                                        $this.submit();
                                    }
                                }
                            }
                        });

                        $finish.appendTo($this.find('p:last'));
                    } else {
                        $.error(id + ': element with class name "finish" missing!');
                    }
                }

                if (opt.titleClick) {
                    $titles.click(function () {
                        var array = $titles.filter('.current-step').attr('id').split('-'), // TODO: try keep the number in an attribute.
                            current = parseInt(array[array.length - 1], 10),
                            clicked = $(this).index();

                        if (clicked > current) {
                            if (opt.next && !methods.execute.call($this, opt.next, clicked)) {
                                return false;
                            }
                        } else if (clicked < current) {
                            if (opt.back && !methods.execute.call($this, opt.back, clicked)) {
                                return false;
                            }
                        }

                        if (clicked != current) {
                            methods.step.call($this, (clicked) + 1);
                        }
                    });
                } else {
                    $titles.css('cursor', 'default');
                }

                $steps.delegate('input[type="text"], input[type="password"]', 'keypress', function (evt) {
                    var key = (evt.keyCode ? evt.keyCode : evt.which);

                    if (key == 13) {
                        evt.preventDefault();

                        var $buttons = $(this).parent().children('.' + id + '-buttons');

                        if ($buttons.length) {
                            var $next = $buttons.children('.button-next');

                            if ($next.length) {
                                $next.click();
                            } else {
                                var $finish = $buttons.children('.finish');

                                if ($finish.length) {
                                    $finish.click();
                                }
                            }
                        }
                    }
                });

                $steps.first().find(':input:visible:enabled').first().select().focus();
            });
        }, createBackButton: function (index) {
            var $this = this,
                id = this.attr('id'),
                opt = this.data('options');

            $('<a/>', {
                id: id + '-back-' + index,
                href: 'javascript:void(0);',
                'class': 'button-back btn btn-info',
                html: opt.backLabel
            }).click(function () {
                if (!opt.back || methods.execute.call($this, opt.back, index - 1)) {
                    methods.step.call($this, (index - 1) + 1);
                }
            }).appendTo($('#' + id + '-buttons-' + index));
        }, createNextButton: function (index) {
            var $this = this,
                id = this.attr('id'),
                opt = this.data('options');

            $('<a/>', {
                id: id + '-next-' + index,
                href: 'javascript:void(0);',
                'class': 'button-next  btn btn-info',
                html: opt.nextLabel
            }).click(function () {
                if (!opt.next || methods.execute.call($this, opt.next, index + 1)) {
                    methods.step.call($this, (index + 1) + 1);
                }
            }).appendTo($('#' + id + '-buttons-' + index));
        }, execute: function (callback, index) {
            var isValid = callback.call(this, index + 1);

            return isValid || isValid === undefined;
        }, step: function (index) {
            index--;

            var $steps = this.children('fieldset');

            if (index > $steps.length - 1) {
                index = $steps.length - 1;
            }

            var opt = this.data('options');
            max = index;

            if (opt.validate) {
                var isValid = true;

                for (var i = 0; i < index; i++) {
                    isValid &= methods.validate.call(this, i);

                    if (opt.block && !isValid) {
                        max = i;
                        break;
                    }
                }
            }

            $steps.hide().eq(max).show();

            var $titles = $('#' + this.attr('id') + '-titles').children();

            $titles.removeClass('current-step').eq(max).addClass('current-step');

            if (this.is('form')) {
                var $fields = undefined;

                if (max == index) {
                    $fields = $steps.eq(max).find(':input:enabled:visible');
                } else {
                    $fields = $steps.eq(max).find('.error').select().focus();
                }

                $fields.first().select().focus();
            }

            if (opt.select) {
                opt.select.call(this, max + 1);
            }

            return this;
        }, validate: function (index) {
            if (!this.is('form')) {
                return true;
            }

            var $step = this.children('fieldset').eq(index),
                isValid = true,
                $title = $('#' + this.attr('id') + '-titles').children().eq(index),
                opt = this.data('options'),
                $validate = this.validate();

            $($step.find(':input:enabled').get().reverse()).each(function () {
                var fieldIsValid = $validate.element($(this));

                if (fieldIsValid === undefined) {
                    fieldIsValid = true;
                }

                isValid &= fieldIsValid;

                if (isValid) {
                    if (opt.errorImage) {
                        $title.removeClass('error-image');
                    }
                } else {
                    if (opt.errorImage) {
                        $title.addClass('error-image');
                    }

                    $validate.focusInvalid();
                }
            });

            return isValid;
        }
    };

    $.fn.stepy = function (method) {
        if (methods[method]) {
            return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof method === 'object' || !method) {
            return methods.init.apply(this, arguments);
        } else {
            $.error('Method ' + method + ' does not exist!');
        }
    };

    $.fn.stepy.defaults = {
        back: undefined,
        backLabel: '&lt; Back',
        block: false,
        description: true,
        errorImage: false,
        finish: undefined,
        finishButton: true,
        legend: true,
        ignore: '',
        next: undefined,
        nextLabel: 'Next &gt;',
        titleClick: false,
        titleTarget: undefined,
        validate: false,
        select: undefined
    };

})(jQuery);
